Issue 26063. Index declarations in even partically analyzed units.

pkg/analysis_server/test/services/index/index_test.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:analysis_server/src/services/index/index.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/summary/idl.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
@@ skipping 104 matching lines @@
     List<Location> locations = await index.getDefinedNames(
         new RegExp(r'^[A-E]$'), IndexNameKind.topLevel);
     expect(locations, hasLength(5));
     _assertHasDefinedName(locations, topA);
     _assertHasDefinedName(locations, topB);
     _assertHasDefinedName(locations, topC);
     _assertHasDefinedName(locations, topD);
     _assertHasDefinedName(locations, topE);
   }
 
+  test_getDefinedNames_topLevel2() async {
+    _indexTestUnit(
+        '''
+class A {} // A
+class B = Object with A;
+class NoMatchABCDE {}
+''',
+        declOnly: true);
+    Element topA = findElement('A');
+    Element topB = findElement('B');
+    List<Location> locations = await index.getDefinedNames(
+        new RegExp(r'^[A-E]$'), IndexNameKind.topLevel);
+    expect(locations, hasLength(2));
+    _assertHasDefinedName(locations, topA);
+    _assertHasDefinedName(locations, topB);
+  }
+
   test_getRelations_isExtendedBy() async {
     _indexTestUnit(r'''
 class A {}
 class B extends A {} // B
 ''');
     Source source2 = _indexUnit(
         '/test2.dart',
         r'''
 import 'test.dart';
 class C extends A {} // C
@@ skipping 88 matching lines @@
 ''');
     List<Location> locations =
         await index.getUnresolvedMemberReferences('test');
     expect(locations, hasLength(4));
     findLocationTest(locations, 'test);', false);
     findLocationTest(locations, 'test = 1;', false);
     findLocationTest(locations, 'test += 2;', false);
     findLocationTest(locations, 'test();', false);
   }
 
+  test_indexDeclarations_nullUnit() async {
+    index.indexDeclarations(null);
+  }
+
+  test_indexDeclarations_nullUnitElement() async {
+    resolveTestUnit('');
+    testUnit.element = null;
+    index.indexDeclarations(testUnit);
+  }
+
   test_indexUnit_nullUnit() async {
     index.indexUnit(null);
   }
 
   test_indexUnit_nullUnitElement() async {
     resolveTestUnit('');
     testUnit.element = null;
     index.indexUnit(testUnit);
   }
 
@@ skipping 48 matching lines @@
           location.unitUri == unitUri &&
           location.offset == element.nameOffset &&
           location.length == element.nameLength) {
         return;
       }
     }
     fail('No declaration of $element at ${element.nameOffset} in\n'
         '${locations.join('\n')}');
   }
 
-  void _indexTestUnit(String code) {
+  void _indexTestUnit(String code, {bool declOnly: false}) {
     resolveTestUnit(code);
-    index.indexUnit(testUnit);
+    if (declOnly) {
+      index.indexDeclarations(testUnit);
+    } else {
+      index.indexUnit(testUnit);
+    }
   }
 
   Source _indexUnit(String path, String code) {
     Source source = addSource(path, code);
     CompilationUnit unit = resolveLibraryUnit(source);
     index.indexUnit(unit);
     return source;
   }
 }